> var s = 'foo';

> var l = s['length'];

> // type of l is `string`

beg pardon?

    $ js
    js> var s = 'foo';
    js> s['length'];
    3
    js> typeof s['length'];
    number

    $ node
    > var s = 'foo';
    undefined
    > s['length'];
    3
    > typeof s['length'];
    'number'